-LRB- CNN -RRB- -- Police are searching for any other alleged victims of a Sunday school teacher accused of raping and killing an 8-year-old girl from Tracy , California .

Melissa Huckaby is charged with killing 8-year-old Sandra Cantu , who was a friend of her own daughter .

`` We are asking the public if they have any indication that any of their children may have had inappropriate contact with -LSB- the suspect -RSB- to contact us , '' Tracy Police Sgt. Tony Sheneman said Tuesday evening . `` There has been no indication that this has happened . But she is a Sunday school teacher and did have contact with children , so that is why we are asking . ''

Melissa Huckaby , 28 , was arrested and charged with killing and raping 8-year-old Sandra Cantu , a friend of her 5-year-old daughter .

Huckaby , wearing red jail scrubs over a white T-shirt , was in court Tuesday for an arraignment . She was charged with murder , kidnapping , the performance of a lewd and lascivious act on a child under 14 and rape by instrument .

If convicted , Huckaby would face the death penalty or life in prison without parole , San Joaquin County District Attorney James Willett told reporters after the hearing . A decision on whether to seek the death penalty will be made later , he said .

Huckaby did not enter a plea or speak during the court hearing , although she flinched when Sandra Cantu 's name was spoken , and she cried at times .

Sandra 's body was found April 6 , stuffed into a suitcase and submerged in a pond at a dairy farm . Huckaby was arrested Friday night after questioning by police .

Sandra was last seen alive March 27 in the mobile home park where she lived with her family -- the same mobile home park where Huckaby lives with her daughter . The two children were close friends and played together frequently , police said .

Huckaby is the granddaughter of Clifford Lane Lawless , pastor of Clover Road Baptist Church near the mobile home park , and she taught Sunday school at the church , police have said . The church was searched as part of the investigation into Sandra 's disappearance and death .

Before her arrest , Huckaby acknowledged to a newspaper reporter that she owned the suitcase that contained Sandra 's body . But Huckaby said the suitcase had been stolen .

Willett declined to comment on any of the evidence or allegations in the case , saying evidence would be presented in court .

A memorial ceremony is scheduled for Sandra at 1 p.m. Thursday at a high school in Tracy , police said .

-- CNN 's Ninette Sosa contributed to this report .

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Police comb community for other possible victims

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Melissa Huckaby was arrested and charged with killing and raping Sandra Cantu

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Sandra , 8 , was friends with Huckaby 's 5-year-old daughter